[Beowulf] newbie

Gus Correa wrote:
> On Opteron Shanghai the Intel 10.1 compilers seem to reject
> any architecture-dependent optimization flag above -xW (SSE and SSE2),
> although the processor has SSE3, etc, and would qualify for
> higher levels of optimization, or not?
> Is this deliberate?
Intel builds compilers that generate reasonable performing code on Intel
processors. I think they also generate (or at least they did in the
past) a slower path for more generic processors. AMDs are in this mix.
Our experience with recent gcc suggests it is pretty good relative to
icc/pgcc. Gfortran isn't bad, but we find it easier to build F90 code
with ifort/pgf90 than gfortran. I haven't used g95 much, don't have as
much of an opinion as to ease of portability.
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